Drawing tables

ABSTRACT

Drawing or draughting table comprising a board, fast with plates oscillating on a pivot on which slide two arms adapted to also slide along two posts, pins on the arms penetrating into apertures formed in the plates and in the posts and a cam controlling the sliding action of the arms on the pivots.

United States Patent Charnay [4 1 Feb. 15, 1972 s41 DRAWING TABLES3,140,559 7/1964 Grow et al. 108/6 3,199,825 8/l965 Bellows 108/6 [721"9'!" Charm, 148 Rue mum?" 3,273,517 9/1966 Amthor, Jr. et al.. 108/2PM, 15 we, France 3,358,620 12/1967 Parigi l08/6 22 Filed; 29 19 93,364,88! 1/1968 K001 ..l08/i0 [2i] App]. No.: 888,304 PrimaryExaminer-Bobby R. Gay

Assistant Examiner-Glenn O. Finch 301 Foreign Application Priority DataDec. 31, 1968 France ..1s2s77 ABSTRACT Drawing or draughting tablecomprising a board, fast with [52] US. Cl. ..108/6 plates oscillating ona pivot on which Slide two arms adapted 1 t t 10 to also slide along twoposts, pins on the arms penetrating into [58] Field oi Search ..l08/ 1-]0, 136 apertures formed i the plates and in the posts and a camcontrolling the sliding action of the arms on the pivots. [56]Reierences Cited 1 Claim,'4 Drawing Figures UNITED STATES PATENTSl,956,546 4/1934 Froelich ..l08/2 n 0 we on uantum 4 PATENTED EB 15 I972SHEET 2 [IF 2 DRAWING TABLES The invention relates to a drawing ordraughting table the board of which is adjustable as to slope andheight.

Some constructions make use of systems involving a deformableparallelogram and heavy, cumbersome weights permitting simultaneouslocking adjustments, whereas others employ slides having, however, twoindependent locking adjustments.

The invention relates to a drawing table which is adjustable as toheight and inclination and is characterized in that the drawing board ismounted to oscillate on a pivot constituting the connecting meansbetween the board and two arms sliding on the one hand along two fixedlegs and on the other hand on the pivot, each arm having two lockingpins, one fixing the vertical position of the arm by penetrating into anaperture formed in the leg and the other fixing the angle of inclinationof the board by penetrating into an aperture formed in a plate fast withthe board, a control device permitting the sliding of the arm on thepivot so as to disengage the pins from their aperture.

Further, supplementary features of the invention will be disclosed inthe description given hereinbelow, with reference to the accompanyingdrawings. Of course, the description and the drawings are given purelyby way of nonlimitative example.

FIG. I is a lateral view, in elevation, of a table according to theinvention;

FIG. 2 is is a front, elevational view of the table shown in FIG. 1,without its casing;

FIG. 3 is a section taken along the line llllIl of FIG. 1;

F IG. 4 is a section along the line lV-lV of FIG. 3.

According to the invention, the drawing table shown in the Figurescomprises a base 1 on which is secured a frame 2 comprising two posts oruprights 3 between which slide, vertically, two arms 4 supporting thedrawing board 5.

The board 5 is provided with two plates 6 between which is secured apivot 7 on which slide the two arms 4.

The arms 4 are provided at both ends with pins 8 one of which penetratesinto the apertures 9 formed in the posts, so as to fix the height of theboard and the other into apertures 10 formed in the plate 60 so as tofix the angle of inclination of the board, the said apertures 10 beingarranged in an arc of a circle about the pivot 7.

In order to control the removal of a pin, a cam 11 formed from a rod ofoval section acts on a bar 12 fixed perpendicular to the arm 4 and theend of which remains in contact with the cam due to the action of twostuds 13 disposed at each end of the arms 4 and urged by a spring 14against the plate 6 on the one hand and the post 3 on the other hand.

The pins 8 are provided with a spring 15 enabling the pin to withdraw ifit is not positioned opposite an aperture.

The pin 8 and the stud 13 are disposed in seatings l6 and 17 at the endof the arm 4, the springs 14 and 15 being maintained in the seating by aplate 18 formed with two apertures for the shank of the pins 8 and ofthe studs 13.

In order to compensate for the weight of the board 5, the bars 12, whichare guided on rods 19, are urged by springs 20 surrounding the said rod19.

In order to provide for the guiding of the lower ends of the arms 4, theframe 2 is covered on either side by walls 21 one of which is formedwith an aperture for the passage of a handle 22 for manipulating the caml 1.

The invention is in no way limited to the mode of embodiment describedand illustrated but, on the contrary, covers all variants.

What is claimed is:

l. A drawing table comprising a base member, a vertical frame secured tosaid member including two apertured posts or uprights, two arms disposedbetween and in slidable contact with said posts, spring actuated pinslocated in the lower end portions of said arms for engagement in theapertures in said posts, to fix the height of said arms, a drawingboard, circumferentially apertured arc shaped plates secured to theunderside of said card in alignment with said posts, a pivot passing

1. A drawing table comprising a base member, a vertical frame secured tosaid member including two apertured posts or uprights, two arms disposedbetween and in slidable contact with said posts, spring actuated pinslocated in the lower end portions of said arms for engagement in theapertures in said posts, to fix the height of said arms, a drawingboard, circumferentially apertured arc shaped plates secured to theunderside of said board in alignment with said posts, a pivot passingbetween said plates, spring actuated pins in the upper end portions ofsaid vertical arms for engagement in the apertures in said plates, tofix the angle of inclination of said board, and means for controllingthe location of said pins, comprising a cam rod disposed centrally ofsaid frame, vertical guide rods on each side of said cam rod, andspring-supported horizontal bars on said guide rods between said cam rodand said arms.